how to fix P0302 misfire code on Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, ratchet.
• Remove the ignition coil from cylinder 2 by unscrewing the mounting bolts and gently pulling it out.
• Remove the old spark plug using a spark plug socket. Inspect for signs of damage or fouling.
• Install the new spark plug, ensuring it is torqued to the manufacturer's specifications (typically around 13 ft-lbs for Honda).
• Reinstall the ignition coil.

3. Replace Ignition Coil (if needed)

• Tools Required: Socket set, torque wrench.
• If the ignition coil shows signs of damage or failure upon inspection, replace it with a new one.
• Ensure the new coil is securely fastened and plugged back in.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if cleaning), socket set.
• Remove the fuel rail to access the fuel injector for cylinder 2.
• If the injector is clogged, use a fuel injector cleaning kit to clean it or replace it with a new one.
• Reinstall the fuel rail with the injector securely in place.

5. Perform Compression Test

• Tools Required: Compression tester.
• Reinstall the spark plug and ignition coil before performing the compression test.
• Follow the compression tester's instructions to check cylinder 2’s compression. A reading below the specified range indicates potential internal engine problems.

6. Reassemble and Reconnect

• Reconnect all components and ensure everything is secured.
• Reconnect the negative battery terminal.